Gang-drill.



Patented Mar. 23, 191.5.

2 SHEEI8-SHEET 1'1 HIS ATTBRNEY A. HILL. GANG DRILL.

APPLIGATIOW FILED-JAN 21, 1914 ow NN mmsmw;

A. HILL. GANG- DRILL 0 APPLICATION FILED JAN.Z1, 1914 Z SHEETS-SHEET 2;;

Patentefl Mar.- 23, 1915.

operate.

vation of a gang.

and, Fig.

rare

T roin.

rarer, arms antennas, ennrronuia, assisuon. or onn-roun'rn To narnounruns BLAKESLEE, or; ran, eamronnm.

GANG-DRILL.

{Application filed January 21, 1914;. Serial No. 813,433. I

i a ail whom it may concern:

Beat known that l, AARON HILL, a citizen cf the United States, residingat Los An' geles, in the, county of Los Angeles and State of California,haveinvented new and useful Improvements in 'Gang Drills, of which thefollowing is a specification.

lhis invention relates to gang drills or machines with a plurality ofdrills for simultaneous or related operation; and it has for its objectto provide improved gang drill meehanism'which will be superior in pointof relative simplicity and inexpensiveness-taken in connection withpositiveness in operation, facility incontrol, speed of operation, andfacility in applying and handling the work upon which the drills .Withthe above and other objects in view, the invention consists in the noveland useful provision, construction, combinationand relative arrangementand association of parts,,members and features, all as hereinafterdescribed, shown in the drawings and finally pointed out in claims.

In the drawings: Figurel' isa front eledrill mechanism constructed andorganized in accordance with the invention; Fig; the same; Fig. 3 is atransverse sectional view on the line 3.-3' of Fig. 4, looking in thedirection of the arrows; Fig. 4 is a similar view taken upon. the linew*--m,-

Fig. 1, and looking in the direction .of the appended arrow; Fig. 5 is.a detail vertical transverse sectional View taken upon the line an -nFig. 1, looking in the direction of the appended arrow; and Fig. 6 is adetail transverse sectional view taken on the line cu -m Fig. 1, andlooking'in the direc-' Fig. 7 1S a detion of the appended arrow; tailhorizontal transverse sectional view taken on the line w m", Fig. 2, andlooking in the direction of the appended arrows; 8 is a fragmentaryelevation showing closely? grouped relation between several of thespindles and sprockets and attendant features shown in Fig. 1. Figs. 3to 6 inclusive are uponan enlarged scale.

Corresponding parts in all the figures are designated by .the sameReferring with particularity to the drawings', A, A designate each aseparate drill element all being shown as applied to work B such as astructural iron beam which 2 is a side elevation of' end supportsreference characters.

. lipecifiea tion of Letters men. P te t d Mar. 23, 1 9915.

to receive a pluralitybf spaced holes, the

drills being shown as vertically arranged, and the work being mountedupon a movable support 0 slidable vertically at its ends by keepers 7upon end frame uprights 8 which also support ahorizontal top framemember 9 carrying drill spindle bear ngs 10, one .foreach drill, eachspindle'll being provided with, a sprocket 12, the said sprocketsthroughout the series of spindles being in stag cred relation so that anupper tier of sproc ets is, provided for engage-- ment by a link belt 13passing about a drive sprocket ll at one end of the 'framemeniber 9 andabout an idler 15 at the other end of the frame member '9; the. lowertier] of sprockets 12 being engaged-with alink belt lfiopei'ating arounda drive sprocket 17 b,e-

neath the idler sprocket 1'5, and an idler sprocket 18 beneath the drivesprocket 14.

The idler sprocket 18 is loose upon-a vcrtical drive shaft 19 suitablyjournaled in the end of the frame member 9, the drive sprocket 14 beingkeyed tosaid shaft 19. The idler 15 is loose upon a 'driveshaft 20 towhich is keyed the,drive sprocket 17.

Said drive shafts are adapted to be rotated-- by operating means D,jointly orv separately, such, means including main line shafts 21 and 22at the opposite ends'of the machine, and journaled in -,brackets 23 andv frame member 9, such shafts having gears 25 and 26 meshingrespectively with other gears 27 and 28 at the upper ends of the driveshafts 20 and 19. The

2% upon the .shafts 21 and 22 are provided with'loose pulleys 29 and 30respectively with which cooperate friction clutches 31 and 32 splined orfeathered to the shafts 21 and 22, such clutches being cross-connectedby a link rod 33 joining the ,arms 34: and 35 of the clutches. i

-E designates operating means for the vertically movable work support C,the same including a drive shaft 3.6 journaled in the posed in positionsto play upon rollers 38 mounted at theforward ends of pivotallyoperating elevated arms 39 which are adjustably connected .with andbeneath the 105 work suppert C,

mensions and depth of drilling. One arm 1 8 and carrying cams 37 dis-39, extendsrearwardly of its pivotal center 41, as at 12, and a rigidlink rod 43 extends between such extension and. the shorter upon a shortshaft 19; carrying a' sprocket 50 which through a link belt 51 rotatesthe operatingshaft 36 which carries loosely a sprocket wheel 52, thehub- 52 of which-is provided with a plurality of pivoted'dogs or pawls53 adapted to 'co-act with teeth 54;

upon the inner surface of an annulus 55 ;keyed,-'as at 56, to theshaft'36. Each pawl.-

'. is. pressed toward engaging position by a compression spring 52between the same and the hub of'the sprocket wheel. Hand i spokes57.radiate from the annulus 55, and

' by means of the samethe shaft 36 may be the machine.

given movement independently of the dogs and the sprocket wheel toposition the work support as desiredthrough the aid of'the cams 37 priorto the setting up operation of VVhen the rollers ride over thenoses ofthecams and the work support is thus permitted to drop the'link e3 and'bell crank Mmove the-link rod 33 to disconnect the clutches 31 and 32from the pulleys 29 and 30, terminating rotation of the drive shafts 20and '19 and of' the sprocket 52, thus stopping operationofthe drills andof the drive shaft 36 which actuates the work-support. The bearings 10of the drill spindles-11 are slidably applied 'to the top frame member 9which they overlap at topand bottom, as at 10 ,,being for' that purposesupplied with a bored head through which pass-tie-bol'ts 10 secured attheir rearward ends to back' plates, 10, whereby the bearingsand-spindles and thus the entire drills A may be adjusted. lengthwise ofthe machine and endwise, of the;

frame member 9, and clamped in positions of adjustment by means of nuts10 threaded into the forward ends of the tie-bolts 10 The frame member 9preferably consists of an-I-beam within theforward channel of which is,disposed a relatively soft-retaining plate 58 between which and the webof the beam 9 are disposed a'metal back-plate 59 and spacing blocks orstrips 60, said plates .and blocks beingstra pped to the beam web bytie-bolts '61 extending through said plates the respective series ofsprockets 12 upon and adjusted to effectively hold the link belts orsprocket chains to the sprockets to c(1)1npensate for wear upon theretaining p ate. p

The link43 is preferably divided and provided with an elongated slot andpin connecting device whereby the bell crank 44 is thrown to throw outthe clutches 31 and 32 when the arms 39 drop as permitted by the cams37; this means of connection or lay permitting the work support and work6 be elevated into position for commencement of operation, through theagency of the hand spokes 57, in the manner above described, withoutreversely throwing the bell crank 44 and seat-mgthe clutches 31 and 32,which latter operation is manually performed by the operator through theagency of the long arm of the bell crank 44..

The operationand method of use of the gang drill mechanism constitutingthe invention has beenset'forth during the recitation of theconstruction and combination and inter-relation of parts and features,and will be readily understood without further detailed description.

' The staggered arrangement of the sprocket Wheels 12 permits the sameto over-lap so that a closer assemblage of the drills is permitted, anda lesser spacing of the resultant drill holes is permitted, thuspermitting a wider range of operation than otherwise possible.

It will be understood from the above description that each piece of workplurally drilled as predetermined, and that upon the completion of thedrill holes the work support drops with the work, the link 43 throw- Ying out the clutches 31 and 32, terminating rotation of the operatingshaft 36 androtation of .thedrill spindles 11, no further drillingoperation being performed until a fresh piece of work has been broughtinto position and the clutches 31 and 32 are manually set as described.

Each drilling operation is thus independent of preceding andsucceedingoperations, and unskilled labor may thus be employed in operating themachine without danger of injury to the person or work throughuncontrolled operation.

' Having thus described my invention, I claim and desire'to secure byLetters Patent:

1. In a machine of the character disclosed. a drill, means for operatingthe same, a movable work support, means for operating the work support,andmeans operating automatically for jointly throwing out of opera..tion the drilland the means as operating the work support;

'2. In a machine of the character disclosed,

a drill, means for operating the same, a mov- V able work, support,means for operating the so drills. d i r 6. In a machine of thecharacter disclosed,

weenie m *"worhsupport, and means operating automatically fnr ointlythrowing out of operation the drill and the means for operating the worksupport; means being provided lt for tinde;penden'tly operating the worksuppor.

- 3. A gang drill machine, comprising a pluralityof separate drillsarranged in a i a; plurality of'drills divided into two groups,

- and separate means for operating ,thedri-lls an of each group; saidlatter means including staggered sprockets the relative positions ofwhich permit close assemblage of the drills.

In a machine of the character disclosed,

. a plurality of drills divided into two groups,

as asprocket wheel mounted on each of said drills, saids'procket wheelsbeing arranged in staggered relation, and separate link beltsapplied tothe'sprocket wheels of the respective drill groups for a support, adrill spindle mounted upon the support, asprocket wheel mounted onsaiddrill spindle, a link belt applied to the sprocket wheel to operate thesame, and

1 means for holding the link belt in its travel to the sprocket wheel-.

' 7. In amachine of the character disclosed,

a support, a drill spindle mounted upon the as support, a sprocket wheelmounted on said drill spindle, a link belt applied to the sprocket wheelto operate the same, and a recessed retaining, plate connectedwith thesupport and holding the link beltin its travel to the sprocketwheelymeans being provided for adjusting-the retaining plate withrespect to the support.

8'. In a machine of the character disclosed, a support, a drill spindleadjustably mounted upon the support, a sprocket wheel mounted on saiddrill s indle, alinkbelt applied tothe sprocket w eel to operate thesame, and a recessed retaining plate connected with thesupport andholding the'lin'k belt at in its .travelto the sprocket wheel.

, 9. In a machine of thecharacter disclosed, a frame provided with atransverse member and with upright members, a plurality ofarparatedrills mounted upon the transverse ineiuber, a work supportvertically movable nppn the upright members, a shaft beneath thaw arksupport, a cam upon said shaft co;

a drive shaft, and a single the operation of the Witnesses:

operating with said work support, a vertical .swingin arm connected withthe work sup port an ceoperatingwith said cam, means 6t for operatingsai'd drills, means for operating said shaft, and means connected withsaid swinging arm for jointly throwing said drills and said shaft out ofoperation.

10.. In a machine of the character closed, a plurality of separatedrills each having a drive sprocket, said drills being" divided into twogroups, said sprockets being staggered, a drive shaft for each group,

, ofdrills, operative connections between the drills of each group andits respective drive: shaft, separate power applying shafts for thedrive" shafts, separate. clutches for the power applyingshafts, andmeans operatively connected with both clutches for rendering operativeor inoperative the power applying shafts. I 11. In a'machine of thecharacter-disclosed, a plurality of separate drills, a sepa-. rate drivesprocket on each drill, said drills being divided into two groups, saidsprockets beingstaggered to permit close assemblage of the drills, adrive shaft for each group of drills, operative connections between thedrills of each group and its respectivedrive shaft, separatepower'ap'plying shafts for the drive shafts, separate clutches for thepower applyingshafts, and means operatively connected with both clutchesfor rendering operative or inoperative the power applying shafts; incombinaa tion with a movable work support, a drivesliaft for the worksupport, means for operating the drive shaft jointly with the drills,

cams upon' the drive shaft for raising and lowering the work support,and means actuated by said cams for throwing the drive shaft of the worksupport out of operation automatically and jointly with the powerapplying shafts.

12. A gang-drill-machine, comprising a plurality of separate drillsarranged in a working series, a drive shaft, and a single link beltoperatively applied to all of the .drills and to the drive shaftwhereby, the

former may be operated'upon-rotation of the latter; each of said drillscomprising a drill spindle provided with a drill proper and with aseparatesprocket wheel .which coiiperates with said link belt; saiddrill spindles being relatively ad ustable to permit variations in thegrouping of the same.

In testimony whereof, I have signed my j 1 nameto this specification inthe presence of two subscribing witnesses; v

' AARON Amman I-I. Dimmers, W. F. Coon.

